Amazfit says its new Arc activity tracker offers heart rate tracking and a 20-day battery for just $50. However, the wearable is missing some valuable features found in more expensive devices, and its price will increase by nearly 50 percent in December.

​Amazfit Arc reviewHuami's on a roll this year. The Chinese company has already released the Amazfit Moon Beam and Equator wearables, which weren't perfect but fantastically eye catching devices nonetheless, […]